Educational device.



J. G. WARPIELD.

EDUCATIONAL DEVICE.

APPLICATION III-ED JULY 1-1, 1909.

Patented Sept. 6, 1910.

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' 'UNITED STATES PATENT OFFICE.

JOHN G. WARFIELID, or Los ANGELES, CALIFORNIA, AssIGNoR or ONE-FOURTH T00. R. HARRIs, OF Los ANGELES, CALIFORNIA.

EDUCATIONAL DEVICE.

Specification of Letters Patent.

Patented Sept. 6, 1910.

v To all whom it may concern:

Be it known that I, JOHN G. WARFIELD, a citizen of the United States,residing at Los Angeles, in the county of Los Angeles and State ofCalifornia, have invented certain new and useful Improvements inEducational Devices, of which the following is a specification.

My invention relates to an improvement in educational devices, and itsobject is to provide means whereby a long or short column of figures maybe exposed at the will of the operator for the purpose of teachingaddition.

The invention consists of certain novel features of construction andcombinations of parts which will be hereinafter fully described andpointed out in the claims.

In the accompanying drawingsFigure 1 represents a perspective view of myinvention; Fig. 2 is a ertical sectional view, and Fig. 3 is a crosssection.

A, represents a cylindrical body which can be constructed ofany'suitable material, but preferably made of tin and provided at theupper end with an opening, 1. elongated slot, 2, is formed along oneside of the cylindrical body, and flanges, 3, 3, are formed along theopening. The slide, 4, has flanges, 5, thereon, which are adapted toengage the flanges, 3, on the cylindrical body to permit the slide tomove vertically on the cyllndrical body. A handle, 6, is formed on theslide for operating the slide. The cylindrical body, B, is receivedwithin the cylindrical body, A, and is provided with a shank, 7, whichis adapted to be received through the opening, 1, at the upper end ofthe body, A. The shank, 7, is bent down and upon the body A, for holdingthe member, B, in position. The shank, 7, forms a loose connectionbetween the members, A,'

and, B, and permits the member, B, to rotate within the member, A. Onthe outer surface of the member B, columns of figures, 8, are formed,which can be applied to the member, B, in any suitable manner. The loweredge is "bent at right angles and is adapted to engage the inner surfaceof the member, A, whereby the member, B, is centrally held within themember, A, thereby preventing the columns of figures from coming incontact with the inner surface of the member, A, and thus becomingmarred or removed. When it is desired to present a new column of figureswhich can be examined through the slot, 2, the o erator will take themember, A, in one han and insert the other hand in the member, B, and byturning the member, B, a new column will be brought into view, and bymoving the slide, 4, any number of figures can be re sented for adding.By this method di erent columns of figures can be presented and added bymoving the slide vertically upon the member, A.

It is evident that more or less slight changes might be made in the formand arrangement of the several parts described without departing fromthe spirit and scope of my invention, and hence I do not wish to belimited to the exact construction herein set forth, but:

Having fully described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. An educational appliance comprising an inner and outer member, theouter member having an opening through one end thereof, a shank on theinner member passing through the opening in the outer memher forconnecting the inner member there to, whereby the inner member iscapable of being rotated within the outer member, said inner memberhaving columns of characters thereon, said outer member having anopening therein for exposing the characters on the inner member, and aslide for varying the amount of exposure of the column on the innermember through the opening in the outer member.

2. An educational appliance comprising inner and outer members havingclosed upper ends and open lower ends, the outer member having anopening therethrough, a shank on the inner member adapted to passthrough the opening in the outer member for connecting the memberstogether whereby the inner member is capable of rotation within theouter member, said inner member having columns of characters thereon,said outer member having a slot therein through which the characters areexposed, and a slide on the outer member for varying the amount ofexposure of the column of charalcters on the inner member through the s0t.

3. An educational device comprising inner and outer members having oneend open, supporting the inner member Within the the inner memberprovided With columns of outer member. 10 1 characters thereon, theouter member having In testimony whereof I afiix my signature, a slottherein through Which the characters in the presence of two Witnesses.

are exposed, a slide on the outer member for I JOHN G. WARFIELD. Varyingthe amount of exposure of the co1- \Vitnesses:

umn of characters on the inner member WV. M. HOLBROQK,

through the slot, and means for rotatably J. B. HILMER.

